Hey everyone, I'm hoping to find some help here. I've been going insane over this problem I've been having with my car. I'd like to add that I normally know what I'm doing when it comes to tuning, I've tuned over 100 hondas, however this problem has me stumped and frustrated.
The setup, including key points of interest:
Stock internal GSR longblock with ARP head studs
Garrett 60-1
Cast Inline Pro manifold
2.5" downpipe
Stock 1.7 bar map sensor
Tial bov/wastegate. The wastegate has a 9psi spring in it, with no boost controller
Ngk Bkr7e's gapped at .020
NGK plug wires, 1 year old
new Doorman Distributor (Had this problem before replacing the distributor) with new cap/rotor
NepTune RTP on a p28 ecu
RC 550cc injectors,
AEM Fuel Rail
Aem Fuel regulator (set at 43psi)
New fuel filter
New Walbro 255
No Catalytic converter
New Yonaka ws2 knockoff exhaust
AEM UGEO wideband with new sensor

The problem:
The car under boost will basically feel like it's shutting off around the VTEC crossover. I have had successful/clean pulls with vtec set at 4000rpm, (really too low) and with vtec set at 8000 rpm. The problem still will happen without vtec activating, but I have never had a clean 4800rpm vtec activation. I will have good AFR's right until this happens (11.5-12.0:1). The problem mainly happens just as I hit full boost (9psi).

I have been fighting this problem for the past year. It has happened to me while running eCtune, with the ostrich, before switching to the rc550's, new exhaust, gutting the cat, upgrading the fuel pump, replacing the fuel filter, changing the distributor, changing spark plugs, and replacing the fuel filter.

I have ran a fuel pressure test under boost, while the problem occurs, and it remains constant.

I have a few logs of this happening. Ignore the recorded AFR numbers. Some of them do not match the actual AFR's, because I didn't adjust the offset. (For instance the couple of them that were in the 13.5's were actually 11.5's) however the AFR spike shows you the problem that occurs. You can see that I never lifted the throttle until after the problem happened.





And for comparison, a clean pull made when the vtec crossover was set at 4000rpm



I just want to get the ball rolling on solving this issue. I will try to get some videos of this happening, so you can get a full understanding. It doesn't feel like it's breaking up, or going lean, or blowing out spark... it feels like a fuel cut.

I'm open to any and all suggestions. Getting my hands on a new OEM distributor isn't really an option as of right now, but I'm about to pull this one back off. Along with ohm'ing out all of the injector wires at the ecu, to make sure there isn't any funny business going on there.

 

Fixed.

For what it's worth, and if anyone finds this thread in a search, quadruple check your ignition coil. Mine was only 600 miles old, and fried. I pried the metal shield off of the back of the coil to find a rainbow effect/hot spots on the coil. Swapped it out and back in business.

 

Dont use aftermarket replacement ignition parts. They are all horrible.

 

Are there correction factors in your maps? Try disabling all of them.

Does this car have a modified engine or cabin harness? I've seen many of modified harnesses cause interference which messes up a lot of different things. Mainly, the distributor signals.

 

You got a 2 step?